Individual drive for textile machine spinning spindle

ABSTRACT

A spinning spindle of a textile machine is individually driven by a two-pole electric motor. The motor has a stator and a rotor rotatably journalled in the stator and coupled to the spindle. The stator includes a stator yoke and a flat ring winding surrounding the yoke.

United States Patent Volkrodt 1 June 26, 1973 INDIVIDUAL DRIVE FORTEXTILE 3,095,687 7/1963 Beerli 57/100 MACHINE SPINNING SPINDLE3,492,520 1/1970 Yates 310/162 2,512,325 6/1950 Hansen 171/252 Inventor:g g Volkrodl, Muhlbach, 3,194,990 7/1965 Kendall 310 10 Germany3,517,237 6/1970 Lloyd 310/162 1 1 Assignee Siemens AkfiengesenschamBerlin, 31333:??? 3/13}; 13335111............,.........:1i:1:.?3/i83Germany [22] Filed: June 2, 1971 Primary ExaminerR. Skudy [2]] Appll49260 Att0rr1eyCurt M. Avery, Arthur E. Wilfond, Herbert L. Lerner andDaniel J. Tick [30] Foreign Application Priority Data June 3, 1970Germany P 20 27 134.5

52 US. c1 310/68, 310/156, 3l0/DlG. 3, 1571 ABSTRACT 57/100 [51] Int.Cl. H02k 11/00 A spinning spindle of a textile machine is individually[58] Field of Search 310/67, 68, DlG. 3, driven by a two-pole electricmotor. The motor has 21 310/162, 156, 10, 66; 57/100; 318/354 stator anda rotor rotatably journalled in the stator and coupled to the spindle.The stator includes a stator [56] Reterences Cited yoke and a flat ringwinding surrounding the yoke.

UNITED STATES PATENTS Abbott 57/100 2 Claims, 6 Drawing FiguresPATENTEDmzs ms 3.742.268

1 w .T. l s

Fig.1 Fig.2 Fig.3

PRIOR ART INDIVIDUAL DRIVE FOR TEXTILE MACHINE SPINNING SPINDLE Intextile technology very high rotation speeds are required for spinningspindles. When spindles are driven by belts or bands, there occurdifficulties with these high speeds so that one is encouraged to developindividual drives for the spindles. For driving spindles at speeds over10,000 rpm, two-pole motors are required which have relatively largeend-turns in the stator windings. This in turn has the disadvantage thatthe distance between the upper spindle bearing and the center of gravityof the spindle and spool is increased by the necessary height of themotor. This increase in spacing is disadvantageous when the criticalrotation speed is exceeded.

Accordingly, it is an object of my invention to reduce theabove-mentioned center of gravity spacing for an individual drive to benot greater or only slightly greater than that associated with amechanical spindle drive.

Subsidiary to this object, it is an object of my invention to provide anindividual spindle drive equipped.

with an electric motor wherein the aforementioned spacing to the centerof gravity is kept as small as possible.

According to a feature of the invention, the individual drive of aspindle is provided with a two-pole electric motor whose stator has aflat ring winding surrounding the stator yoke. By means of a ring woundstator, the motor may be configured so as to have a relatively shorterheight or elevation, so that a smaller spacing of the center of gravityof the spindle and spool taken from the upper spindle bearing ispossible.

The invention will now be described with reference to the accompanyingdrawings, wherein:

FIGS. 1 to FIG. 3 respectively illustrate a mechanical spindle drive, anindividual drive using ,a conventional motor and a spindle driveaccording to the invention;

FIG. 4 is a sectional view of a two-pole asynchronous spindle drivemotor;

FIG. 5 is a cross-sectional view of a two-pole permanent magnet excitedsynchronous motor; and,

FIG. 6 illustrates an elevation view of the synchronous motor of FIG. 5.

FIGS. 1 to 3 serve to mutually compare a mechanical spindle drive,individual drive equipped with a conventional motor and a spindle driveaccording to the invention. The spindles are designated by referencenumeral 1 and the spools placed thereon by reference numeral 2.Reference numeral 3 designates the upper bearing of the spindles and thespacing from this bearing location to the center of gravity of thespindle and spool is designated by S. From FIGS. 1 to 3 it is evidentthat the spacing S for the individual drive equipped with theconventional motor (FIG. 2) is substantially larger than spacing for themechanical band drive of FIG. 1 because of the construction height orelevation dimension conditioned by the larger stator winding end turns4. With the individual drive according to the invention illustrated inFIG. 3, the elevation dimension of the motor is comparatively shortbecause of the application of a ring wound motor stator. Consequently,the spacing S is only slightly larger than the spacing in the mechanicaldrive.

FIG. 4 illustrates a two-pole asynchronous motor which serves as aspindle drive motor and has a stator 6 provided with a flat ring winding7 which surrounds the stator yoke. To protect the winding, the stator issurrounded by a covering 8. The ring does not only lie in the slots ofthe stator, but is also wound around the stator yoke. In this way, theotherwise necessary large end turns are avoided and, accordingly, thewinding is designated a flat ring winding.

In FIGS. 5 and 6, the individual drive is comprised of a two-polepermanent magnet excited synchronous motor, that is, the rotor 9 isequipped with permanent magnets 10, while the stator 11 is againprovided with aflat ring winding 7. Reference numeral 12 designatesdamper bars in the rotor.

One or more galvanomagnetic devices such as, for example, Hall generator13, are arranged at the end face of the ring wound stator 11 in thevicinity of the air gap. The Hall generators 13 serve to detect the instantaneous polarity of the magnetic field of the rotor permanentmagnets and the polarity change, so that the Hall generators 13 can beused to time an electronic power circuit for regulating rpm.

While the invention has been described by means of a specific exampleand in a specific embodiment, I do not wish to be limited thereto forobvious modifications will occur to those skilled in the art withoutdeparting from the spirit and scope of the invention.

I claim:

1. An individual drive for rotating a spindle of a textile machine,comprising a two-pole electric motor, said motor having a stator and arotor rotatably journalled in said stator and coupled in the spindle,said stator including a stator yoke and a flat ring winding surroundingsaid yoke, said motor comprising permanent magnets disposed in saidrotor for developing a magnetic field that moves with said rotor whenthe latter rotates, said rotor and said stator conjointly defining anair gap therebetween, and at least one galvanomagnetic device mounted atan end face of said stator in the vicinity of said air gap for detectingthe instantaneous polarity and changes of polarity of said magneticfield.

2. An individual drive as claimed in claim 1, wherein saidgalvanomagnetic device is a Hall generator.

1. An individual drive for rotating a spindle of a textile machine,comprising a two-pole electric motor, said motor having a stator and arotor rotatably journalled in said stator and coupled in the spindle,said stator including a stator yoke and a flat ring winding surroundingsaid yoke, said motor comprising permanent magnets disposed in saidrotor for developing a magnetic field that moves with said rotor whenthe latter rotates, said rotor and said stator conjointly defining anair gap therebetween, and at least one galvanomagnetic device mounted atan end face of said stator in the vicinity of said air gap for detectingthe instantaneous polarity and changes of polarity of said magneticfield.
 2. An individual drive as claimed in claim 1, wherein saidgalvanomagnetic device is a Hall generator.